2 ants start at 2 different corners of a cube that is suspended in space and simultaneously begin crawling across edges of the cube. Both always start at the same time, and reach their respective opposite corners at the same time. If they cannot ever cross one another or meet at the same corner, and no edge can ever be traversed by either ant more than once, what is the maximum number of edges they can cross in total before 1 or both of them will be unable to cross an edge of the cube?